JP2704420B2 - Multiple clamping device - Google Patents

Abstract

A multiple chucking device is disclosed, which is suitable in particular for clamping in grooves of a machine table. The device includes a clamping block, at least one clamping piece, and an end block which are mounted on a pair of guide axles. The clamping block is rigidly supported on the pair of guide axles, and the clamping pieces and the end piece are adjustable in a longitudinally displaceable manner, and may be secured by locking screws that engage the axles. The clamping piece and the end block are equipped with a clamping jaw in the form of a wedge collet, and with a support housing a recess, in which an obliquely downwardly extending tightening screw is located. The screw is tightened by the wedge collet so as to engage and clamp a workpiece. The clamping block, the clamping pieces, and the end block have clamping surfaces extending on both sides in the axial direction, so that the chucking unit may also be secured by clamping shackles acting on the clamping surfaces, with the aid of clamping elements and the T blocks sliding in the grooves of the table.

Description

The invention relates to a multiple clamping device for a workpiece to be machined according to the preamble of claim 1.

2. Description of the Related Art Various clamping devices are used in machine tools for manufacturing machine parts. For small and relatively simple workpieces, a clamping member or a device including a clamping member is sometimes used in conjunction with a separate clamping jaw and additional forked devices. However, this type of clamping device is not suitable for mass production.

For workpieces that cannot be clamped to the tailstock of a conventional machine tool due to their size and shape, a separate, cost-effective clamping device must be manufactured correspondingly to the workpiece.

Clamp screws are used for direct or indirect clamping of workpieces and clamping devices in machine tools, especially for NC controlled machines, the clamping screws being the T of the machine table.
Or dovetail shaped groove.

An adjustable clamping device for clamping various workpieces according to DE-GM 1983 371 according to German Utility Model DE-GM 1983371 has one workpiece from both sides by a clamping member or two workpieces in a T-shaped groove in the clamping member and the substrate, respectively. , Which can be clamped between a height-adjustable intermediate member fixed thereto. The disadvantage is that in particular the clamping device cannot be extended for a plurality of workpieces.

According to German Utility Model DE-GM1815274, there is known a T-shaped groove / screw member in which a clamping jaw member and its pressure member are arranged on a tension rod in a T-shaped groove of a table. One end of the rod is provided with a guide head, while the other end of the tension rod protruding from the T-shaped groove is provided with a nut, the tightening of which acts on the movement of the pressing member and the groove member. A plurality of workpieces are clamped simultaneously by clamping with an intermediate jaw in which a groove member for guiding the pull rod is also penetrated.
Workpiece clamping is very costly and very precise clamping is possible only in very limited conditions.

In mass production specially adapted and adapted clamping means are used on the machine table to a limited extent, so that, for example, three workpieces can be clamped simultaneously. The disadvantages here are, in particular, that the special clamping means require a large amount of space and do not avoid long adjustment times and large losses due to tool changes.

A disadvantage common to all these clamping devices is that the machine table surface is generally not optimally used.

The subject of the invention is therefore universally suitable for mass production, can be easily adapted to the size and shape of the workpiece and can be used especially for NC-controlled machine tools. Yes,
It is another object of the present invention to create a clamping device that does not have the disadvantages of the known device.

The advantage here lies in the fact that a plurality of workpieces can be clamped very accurately and quickly at the same time, without separate additional equipment and other auxiliary equipment, and always at the optimum position of the machine table surface in the axial and lateral direction of the workpiece. Is to be made available.

(Means for Solving the Problems) The object of the present invention is solved by the configuration of the characteristic part of Claim 1. Other advantageous embodiments of the subject matter of the invention reside in the embodiments of claims 2 to 8.

An advantage of the present invention is the universal availability of a multiple clamping device that can be easily adapted to various shapes and sizes of workpieces without any other auxiliary means.

A particular advantage is that a plurality of second clamp members can be mounted between the first clamp member and the end clamp member, which are fixedly mounted on the guide shaft pair, so that the guide shaft axial direction In this case, the entire length of the existing machine table can be effectively used, and if necessary, the workpiece can be clamped in the guide shaft axis direction only by replacing only guide shafts of various lengths. . Depending on the size and shape of the workpiece to be machined on the machine table, a plurality of clamping members can be arranged in the direction of the guide axis or another clamping member can be arranged parallel to the clamping members. The table surface can be optimally used both vertically and horizontally for large and irregularly shaped workpieces.

With the simple and fast clamping of the device according to the invention, the time required for changing and removing the workpiece in connection with the required tool change is essentially reduced.

The clamp member and the end clamp member can be moved on the guide shaft pair and can be fixed in position with an accuracy of 1/100 mm, so that each clamp member is fixedly arranged on the end face side for zero point movement. A holding jaw and, on the opposite side, a resiliently supported clamping jaw, so that when machining a similar workpiece on an NC-controlled machine tool in an advantageous manner, The machining program once set can be directly applied to all remaining clamped workpieces.

At least two mutually parallel clamping members transverse to the longitudinal direction of the machine table without having to provide a separate clamping unit for clamping complex or irregularly shaped workpieces. Can be arranged.

Arrangement of the clamping members on the machine table by means of a clamping unit comprising a pair of guide shafts, a first clamping member, a second clamping member and an end clamping member additionally having clamping surfaces arranged on both sides. Accordingly, clamping of various sizes and shapes, in particular, irregularly shaped workpieces can be performed easily and optimally.

(Example) In the examples, members having the same function are denoted by the same reference numerals.

FIGS. 1, 2 and 3 show the multiple clamping device in different planes, the multiple clamping device comprising a first clamping member 10, at least one second clamping member 20, 20 ',
.. And a pair of guide shafts 5, 5 to form a clamp unit respectively.
The first clamping member 10 holds two pairs of guide shafts 5, which are fixedly supported on a machine table, not shown, and which are each formed interchangeably by one fixing screw 8. The second clamp members 20, 20 ',... And the end clamp member 30 are movable in the longitudinal direction of the guide shafts via the pair of guide shafts 5, 5, whereby the pair of guide shafts 5, 5 Has a support surface 6 whose upper surface is flat over its entire length. The second clamp members 20, 20 ',... And the end clamp members 30
Are formed on the support surface 6 of the guide shaft 5 so as to be fixed by locking screws 7, respectively.

Each guide shaft 5 can be replaced with one having a length corresponding to the axis length of the machine tool.
Each clamp unit provided with 0, 20, 20 '... 30 is disposed radially with respect to a center axis (not shown) of a machine (a lathe or the like) on a machine table, and is optimal regardless of the length of the machine table. It can be used for

Individual first clamping members 10; second clamping members 2
0, 20 ',... The end clamp member 30 can be clamped to the machine table by the clamp screw 3 via the T-shaped slide member 2 guided in the table groove via the slide member 1, In this case, for example, the first clamping member 10 can be fixed to the machine table by means of two clamping screws 3 in order to ensure a complete holding of the workpiece 35.

A holding jaw 11 having a base 13 is fixedly disposed on the inner end side of the first clamp member 10 over its entire width and on the upper side for holding a workpiece 35. Each second clamping member 20, 20 ',...
The clamp jaw 21 and the clamp jaw 21 are formed as a clamp plate having a wedge inclined surface 22 axially rearward with respect to the 10 or the second clamp members 20, 20 '. And a base 13 'for supporting the lower surface of the workpiece 35 having a concave portion as a relief portion of the clamp member 21. The clamp jaw 21 is provided with four springs 24, preferably four coil springs, via a wedge slope 22. It is elastically supported by the clamp member so as to be movable along the corresponding inclined surface. On the other hand, the second clamping members 20, 20 ',
.., Similar to the first clamp member 10 having the fixed holding jaw 11 on the inner end side facing the end clamp member 30, the lower surface of the workpiece 35 is fixed to the fixed holding jaw 11. A supporting base 13 is provided in combination. The spring force of the compression spring 24 of the clamp jaw 21 facilitates reliable clamping of the workpiece 35 to be machined and removal of the workpiece 35 after its machining. The end clamp member 30 is provided with a concave portion on the inner end side as a relief for the entry of the clamp jaw 21 in the axial direction with respect to the second clamp members 20, 20 '.
13 'is fixedly provided, and a spring-biased clamp jaw 21 is provided on the end clamp member 30 in the same manner as in the case of the second clamp members 20, 20',. It is arranged movably along the inclined surface of the member. The stationary retaining jaw 11 is screwed-into show only the screw axis for better visibility-to the first clamping member 10 or the second clamping member 20, 20 ',. Gold 13 'is held by screws 14
Alternatively, it is fixed to the clamp member 30.

The spring-biased clamp jaw 21 is movable through a wedge slope 22 by screwing a clamp screw 23 facing obliquely downward, whereby the clamp jaw 21 moves downward to clamp in accordance with the wedge slope 22. Since the surface of the jaw 21 on which the workpiece 35 is clamped advances toward the workpiece 35, the workpiece 35 can be clamped between the holding jaw 11 and the opposing holding jaw 11. If the clamp screw 23 is loosened, the clamp jaw 21 is inclined by the force of the compression spring 24.
Since the clamp jaw 21 moves upward in parallel with the workpiece 22, the clamp surface of the clamp jaw 21 that contacts the workpiece 35 is separated from the workpiece, and the workpiece can be removed. First clamp member 10 and second clamp member
Are provided with laterally adjustable stoppers 16 on both sides of the guide shaft pairs 5, 5, respectively.
The stop 16 has two stop holders 15, which are formed in particular as pins and serve for the positioning of the workpiece 35 in a direction transverse to the center axis (not shown) of the machine tool.

One or two O-rings 25 are provided between the wedge-shaped clamp jaw 21 formed as a clamp plate and the second clamp member 20, 20 ′,.
Is provided, so that the cleaning of the clamping unit including the clamping member is ensured during operation.

Depending on the selectable length of the guide shaft 5, the clamping member 10; 2
Each of the clamping units, including 0, 20 '... 30, can be adapted to the entire usable table length of the machine tool. According to the size and shape of the workpiece 35 to be machined, additional multiple clamping devices can be arranged parallel to one another and laterally on the machine table via different guide grooves on the machine table, The adjacent clamping members are connected to one another via a guide shaft 5, so that a vertical and horizontal use of the machine table and optimal use are ensured.

According to FIGS. 1 to 3, a first clamping member 10, a second clamping member 20, 20 ',... And an end clamping member
30 can be arranged at any position on the machine table, i.e., the first clamping member 10, the second clamping members 20, 20 ',. Clamp element 9 guided by a T-slide 2 and a clamping member 3 in different guide grooves and through a slit 4 'of a clamping claw 4 via a T-slide 2 in different guide grooves on a machine table. Can be fixed via the clamping surfaces 19, 29, 39 by
As a result, the workpieces, large or small, and odd-shaped workpieces 35 can be optimally clamped. Each of the clamping members 10; 20, 20 '... 30 is clamped on its opposite axial side by a clamping surface 1 for clamping by a clamping element 9 guided through a slit 4' of a clamping claw 4.
It has 9, 29 and 39.

However, for special workpiece shapes, the clamping unit 5; 10; 2
The fixing of 0,... 30 is effected in part by the clamping pawl 4 combined with the clamping screw 3 and in part with the clamping element 9, so that the production of costly separate clamping means is avoided. You.

[Brief description of the drawings]

1 is a longitudinal sectional view of a multiple clamping device according to the present invention, FIG. 2 is a plan view of the multiple clamping device according to FIG. 1, and FIG. 3 is a view of the multiple clamping device according to arrow A in FIGS. 1 and 2. FIG. Reference numeral 4 in the figure: clamp pawl 5: guide shaft 6: support surface 7: locking screw 9: clamp screw 10: first clamp member 13 ': base metal 19, 29, 39 ... Clamping surface 20, 20 'Second clamp member 21 Work clamp jaw 22 Slope wedge 23 Clamp screw 30 End clamp member

Claims (8)

(57) [Claims] 1. A multiple clamping device for a workpiece, which is clamped in a guide groove of a machine table of an NC controlled cutting and / or grinding machine tool, comprising: a first clamping member (10); and at least one second clamping member. A clamping unit comprising a clamping member (20, 20 ',...) And an end clamping member (30) comprises a pair of pairs each having a support surface (6) which is planarized at the top in the axial direction. A pair of guide shafts (5, 5) by guide shafts (5, 5)
The first clamp member (10) is fixedly supported on the
) And the end clamp member (30) have their axial and paired guide shafts (5,
5) is configured to be axially movable and fixable to the support surface (6) by a locking screw (7) and to each second clamping member (20, 20 ',...); The end clamp member (30) has a clamp jaw (21) with a wedge slope (22) and a platform for supporting the lower surface of the workpiece (35), which has a recess as an escape for entry of the clamp jaw (21). It has gold (13 ') and clamp jaw (2
The clamp jaw (21) is moved through the wedge slope (22) by screwing the clamp screw (23) obliquely from above to below in parallel with the wedge slope (22) with respect to the support surface (6). The first clamping member (10), the second clamping member (35)
The clamping members (20, 20 ',...) And the end clamping members (30) have clamping surfaces (19, 29, 39) on their respective axial sides. . 2. The multiplex according to claim 1, wherein the pair of guide shafts are interchangeable and can be fixed to the first clamping member by a fixing screw respectively. Clamping device. 3. A first clamp member (10) is provided with a second clamp member on the inner end side.
In the axial direction with respect to the clamping member (20),
5) having a rigid retaining jaw (11) with a base (13) supporting the lower surface of each second clamp member (20, 2);
0 ′,...), On the one hand, the first clamp member (1
0) or other second clamping members (20, 20 ',
...), a clamp jaw (2) formed as a clamp plate elastically supported in the axial direction on the side facing the
1), on the other hand, a fixed holding with a base (13) in the axial direction on the side facing the end clamping member (30) or the second clamping member (20, 20 ',...) Jaw (1
1) is provided and end clamp members (30)
Has a base (13 ') on the side facing the second clamp member (20, 20', ...) and has an axis relative to the second clamp member (20, 20 ', ...). 2. The multiple clamping device according to claim 1, further comprising a clamping jaw elastically supported in the direction. 4. A wedge-shaped clamp jaw (21) formed as a clamp plate and a second clamp member (20, 20 ',...).
・) Or the O-ring (2
5. The multi-clamping device according to claim 1, wherein 5) is provided and each clamp jaw (21) is provided with four springs (24). 5. A first clamp member (10) and a second clamp member (20, 20 ',...) Are provided on both sides of a pair of guide shafts (5, 5), respectively, in a direction transverse to the guide shaft axis. 2. The multi-clamping device according to claim 1, further comprising a stopper holder (15) provided with an adjustable stopper (16). 6. At least two clamping units including clamping members (10; 20, 20 '...; 30) are arranged parallel to each other and transverse to the machine center axis on the machine table. A multiple clamping device according to claim 1. 7. A plurality of clamping units including clamping members (10; 20, 20 '..., 30) each having a direction of a machine center axis on a machine table and a clamping claw (4) acting in a vertical direction. 2. The multiple clamping device according to claim 1, wherein the multiple clamping device is arranged transversely to the machine center axis. 8. A plurality of clamping units, including clamping members (10; 20, 20 '...; 30), respectively, by clamping screws (3) and / or on clamping surfaces (19, 29, 39) in table grooves. 8. A device as claimed in claim 1, 6 or 7, wherein the clamp is fixed by means of a clamping pawl (4) which is vertically biased by a vertical clamping element (9) which is mounted on the guided T-shaped slide (2). A multiple clamping device according to one of the preceding claims.